Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ca745c02ff2fad…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 06:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39ad355056f2ee40f022999d303bcefd SHA-1: 8240afb3d8d25b00e7823db93baa04b49174b34c SHA-256: 84ca745c02ff2fad0bc3788139751c2f6a49472d47dd12124b6707a38100f52f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF structure suggest it is designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146becbb9814---gomixudo.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4d7a367sesitab0frg9934qsvv/wikelajakabutozedakuv.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/tinepumokajetonikeroxirep.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/dukulele.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/65989301863.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/85173153793.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/polutus.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/surexawudirukonumasov.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210917/file/43135750117.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36eec73ee---38852402009.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/17695494186.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/80682016312.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zinukeru.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavisuletarozezuxowak.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fdc644bc91ad78c887c1c9bd153ae808/78001756071.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/jopivodi.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/40223218499.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xuvenuzapen.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fisotajaluviz.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/92290752648.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209d418347---10594386033.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/11288877152.pdfIn PDF document text
    • http://checopharma.com/upload/files/wujuzekanapan.pdfIn PDF document text
    • http://kite-surf.sk/files/potafunizovitoguligutok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=screen+time+premium+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10468 bytes
SHA-256: 7a4b683410852feb21691f34ba3d34095d409d12bc58e52b0603aba2c2e63fec
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 18472 bytes
SHA-256: 95c3d31b7c50f21a2b857a16c49097c738156b441b78edd0675c0cdbfc5e7a03
font_02_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1